Merge remote-tracking branch 'origin/master'

Author: mtumilowicz

README.md

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 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 # java12-introduction-to-reactive-programming-workshop
 _Reference_: [Out-of-the-box Reactive Streams with Java 9](https://www.youtube.com/watch?v=COgktgJmP_k)  
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 onNext, item: new mapping: 10
 onNext, item: new mapping: 12
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+```